Plug for oil-holes.



E. P. PIERCE.

PLUG FOR OIL HOLES.

APPLICATION FILED 007.18. 1915.

Patented Jan. 25, 1916.

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ATTOEA/EYQ 'Lorain,"in the county of Lorain and 1 nennstr 2?. France, ornonaimonrog a PLUG non ornsnonns.

messes.

sp t of Letterslatent- Patented Jan. 25, Third.

' Appfieation filled. October 18, 1915. Serial n). 56,514.

To all whom it may concern.

Be it known that Ennnsr PIERCE, a citizen of the United Statesfresidin fat tate of Ohio, have invented certain new and use ful Improvements inPlugs for Oil- Holes, of which the following is a specification.

My invention pertains to plugs for the oil holes in machinery ofdifferent kinds, all substantially as shown and described. In. theaccompanying drawings I show several forms 0 tyles of plugs which e1nbody my invention, one form of which is shown in Figures 1, 2 and 3. Inthis form the plug has a head with substantially semispherical sides anda section thereof is shown in Fig. l in an oil hole and a section of ashaft therewith, and Fig. 2 is aside elevation of the plug in Fig. 1.Fig. 3 is a cross section on line 3-3, Fig. 2. Fig. 4 shows modificationof the plug in that it has a flat sided head, and Fig. 5 is a sideelevation of Fig. a showing the said side milled to facilitate gripping.Fig. 6 shows a plug with flaring top sides and Fig. 7 is a cross sectionon line 7-7, Fig. 6.

The article as thus shown in the several forms or shapes is designed foruse in oil holes to protect the holes and the oil from foulaccumulations, such as dust and dirt, and in allthe forms shown, thearticle is represented as fashioned from asingle piece of spring metalin suitable dies according to the shape desired, and then bent and drawnas will presently appear. Thus, in Figs. 1 and 2 a style of plug isshown which has a split or divided body 2, with approximatelysemi-circular or concaveeconvex head ortions 3 and a drawn integralpoint l. l dlaving struck up the blank to form this plug the blank ispressed to the shape shown in the respective sides thereof and then bentback upon itself at the middle, and the point or extremity isdrawntoshape. This drawing is necessary because thereby the sides.

of the plug become set and fixed in close or nearly closed relations,leaving only what may be termed a slit between them and which providesfor a slight compression of the sides when the plug is pressed into thehole to get a close fit. The headaffords a. grip for the hand and limitsthe entrance of the plug in the hole, and the split at the centerenablesa tool to be inserted to draw the plug out ofa hole. By making the plugslightly tapered it can be driven in so tightly that it will not work orlose out and itis then especially that the entrance of a tool in thehead facilitates removal.

In Figs. 4 and 5 the same constructionis shown as in Figs. 1 and 2except that the head portions have flattened and milled surfaces 6 tomake an effective hand grip.

In Fig. 6 the head of the plug is shown as flaring as indicated by 7,and in this respect the plug is substantially the opposite of Figs. 1and 4. Otherwise this plug is the same as Figs. 1 and The one essentialfeature common to all the plugs shown herein and others that might besuggested, is the drawn end ofthe plug, and which is the finishing actin its manufacture. This also is most important because thereby the plugis caused to retain and hold its shape rather than spring open as itwould if drawing did not occur. The split formation is important also asit affords vent for the oil and admits air enough to insure freelubrication while it excludes the dirt. Heretofore, it has been largelythe practice to use screw threaded plugs for this 1 purpose, but besidesthe time consumed in their use they tend to close the oil hole soperfectly that the plug holds back the oil from feeding. l purposelyprovide for such feed by slightly. enlarging the slit at the bottomthereof as shown at 10. My plug can be instantly inserted and driven inwhen necessary'and can be as quickly and easily removed.

It will be seen that the plug is tubular, with a hollow body, open atone end and closed at the other by the integral portion 4 and that thesaid end is rounded and pointed and with the opening 10 exposed at thebottom to admit air to the oil. The cross section of the body in Figs. 3and 7 show the tubular or cylindrical effect, and the spring of thesides of the body is such that the said sides can be pinched togetheronthe split or slit between them when the plug is inserted in a hole.Hence practically no time at all is required to apply a plug afteroiling and it is .lso as quickly removed. Obviously also, since the plugis machine made out of comparatively light metal it is 7 sisting ofsheet metal and having opposite sides and a divided head and said sidesand head spaced at their edges.

3. A plug for oil holes as described formed in a single piece of metaland having two sides with body and head portions circular in crosssection and said sides integral at their lower ends.

4:. A plug for oil holes as described having a tubular body dividedlengthwise at its middle and having a rounded portion at one end unitingsaid sides and a head portion on each side. A plug't r o l h les h vinga t bular body split lengthwise and an integral portion at the bottom ofsaid split drawn to a rounded shape and provided with a head portion oneach side of said split.

6. A plug for oil holes as described having an integral end and atubular body split lengthwise above said end and constructed .to ventthe plug, the said body being open at its top and provided with half ofa head at each side.

7. A plug for oil holes as described hav ing a split-tubular body openat its top and connected at its bottom and provided with a head havingopposite sides of substantially semi-spherical shape. 7

In testimony whereof I affix' my signature in presence of two Witnesses.

ERNEST P. PIERCE.

Witnesses V Gno. KRICK R, B-.jB- MQ EB- Copies of this patent heobtainedio; ii-v cents'each, by agldressing the commissioner o! Patents,

Weshi tQmD-Q

